[MacPorts] #39643: virtualbox: update to 4.2.16

[MacPorts]

#39643: virtualbox: update to 4.2.16
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  Reporter:  mail@…                              |      Owner:  macports-
      Type:  update                              |  tickets@…
  Priority:  Normal                              |     Status:  closed
 Component:  ports                               |  Milestone:
Resolution:  fixed                               |    Version:
      Port:  virtualbox virtualbox-extension-    |   Keywords:
  pack virtualbox-guest-additions                |
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Comment (by and.damore@…):

 This has reintroduced #36910 for me, host 10.7 using Xcode 4.6.3

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Ticket URL: <https://trac.macports.org/ticket/39643#comment:7>
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